Ulnar longitudinal deficiency (ULD) is a lack of formation of the pinky side of the upper extremity. It usually affects the forearm but can affect the hand, forearm, and upper arm. It can affect bone, muscle, tendon, nerves, and blood vessels. The severity is different in each affected child.

To request an appointment with a physician at St. Louis Children's Hospital, call 314.454.5437 or 800.678.5437 or email us. For additional resources aboutu ulnar longitudinal deficiency, contact our Family Resource Center.